Simulations of Rotating Brushless AC Excitation System with Controlled Thyristor Bridge Rectifier for Hydropower Generators
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
This thesis aims to simulate and find out more about the electrical dynamics of asix-phase exciter for hydropower generators. Because ordinary electric circuit-basedsimulation software only simulate three-phase electrical systems, a FEM-basedsoftware is used for the electrical dynamics simulations of the six-phase system. Theobjective is to analyse the pulsation behaviour of the rectified electrical output on thesix-phase system and compare it to the three-phase system. The three-phase systemis also simulated with filters with the aim of decreasing the amplitude of the pulsationson the electrical output.It is expected that an upgraded system from a three-phase system to a six-phasesystem should double the pulsation frequency on the rectified electrical output.However, the result shows that the rectified electrical output of the six-phase systemconsists of pulsations with unexpected frequencies. The simulated RL-filter on thethree-phase system shows only insignificantly small changes on the rectified electricalpulsation amplitude.
Place, publisher, year, edition, pages
2011. , 39 p.
UPTEC ES, ISSN 1650-8300 ; ES11 024
hydropower, generator, exciter, thyristor
vattenkraft, generator, matare, tyristor
IdentifiersURN: urn:nbn:se:uu:diva-166400OAI: oai:DiVA.org:uu-166400DiVA: diva2:476287
Master Programme in Energy Systems Engineering
Lundin, UrbanPernestål, Kjell